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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package jsonrpc
import (
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/rpc"
"testing"
)
type Args struct {
A, B int
}
type Reply struct {
C int
}
type Arith int
func (t *Arith) Add(args *Args, reply *Reply) error {
reply.C = args.A + args.B
return nil
}
func (t *Arith) Mul(args *Args, reply *Reply) error {
reply.C = args.A * args.B
return nil
}
func (t *Arith) Div(args *Args, reply *Reply) error {
if args.B == 0 {
return errors.New("divide by zero")
}
reply.C = args.A / args.B
return nil
}
func (t *Arith) Error(args *Args, reply *Reply) error {
panic("ERROR")
}
func init() {
rpc.Register(new(Arith))
}
func TestServer(t *testing.T) {
type addResp struct {
Id interface{} `json:"id"`
Result Reply `json:"result"`
Error interface{} `json:"error"`
}
cli, srv := net.Pipe()
defer cli.Close()
go ServeConn(srv)
dec := json.NewDecoder(cli)
// Send hand-coded requests to server, parse responses.
for i := 0; i < 10; i++ {
fmt.Fprintf(cli, `{"method": "Arith.Add", "id": "\u%04d", "params": [{"A": %d, "B": %d}]}`, i, i, i+1)
var resp addResp
err := dec.Decode(&resp)
if err != nil {
t.Fatalf("Decode: %s", err)
}
if resp.Error != nil {
t.Fatalf("resp.Error: %s", resp.Error)
}
if resp.Id.(string) != string(i) {
t.Fatalf("resp: bad id %q want %q", resp.Id.(string), string(i))
}
if resp.Result.C != 2*i+1 {
t.Fatalf("resp: bad result: %d+%d=%d", i, i+1, resp.Result.C)
}
}
fmt.Fprintf(cli, "{}\n")
var resp addResp
if err := dec.Decode(&resp); err != nil {
t.Fatalf("Decode after empty: %s", err)
}
if resp.Error == nil {
t.Fatalf("Expected error, got nil")
}
}
func TestClient(t *testing.T) {
// Assume server is okay (TestServer is above).
// Test client against server.
cli, srv := net.Pipe()
go ServeConn(srv)
client := NewClient(cli)
defer client.Close()
// Synchronous calls
args := &Args{7, 8}
reply := new(Reply)
err := client.Call("Arith.Add", args, reply)
if err != nil {
t.Errorf("Add: expected no error but got string %q", err.Error())
}
if reply.C != args.A+args.B {
t.Errorf("Add: expected %d got %d", reply.C, args.A+args.B)
}
args = &Args{7, 8}
reply = new(Reply)
err = client.Call("Arith.Mul", args, reply)
if err != nil {
t.Errorf("Mul: expected no error but got string %q", err.Error())
}
if reply.C != args.A*args.B {
t.Errorf("Mul: expected %d got %d", reply.C, args.A*args.B)
}
// Out of order.
args = &Args{7, 8}
mulReply := new(Reply)
mulCall := client.Go("Arith.Mul", args, mulReply, nil)
addReply := new(Reply)
addCall := client.Go("Arith.Add", args, addReply, nil)
addCall = <-addCall.Done
if addCall.Error != nil {
t.Errorf("Add: expected no error but got string %q", addCall.Error.Error())
}
if addReply.C != args.A+args.B {
t.Errorf("Add: expected %d got %d", addReply.C, args.A+args.B)
}
mulCall = <-mulCall.Done
if mulCall.Error != nil {
t.Errorf("Mul: expected no error but got string %q", mulCall.Error.Error())
}
if mulReply.C != args.A*args.B {
t.Errorf("Mul: expected %d got %d", mulReply.C, args.A*args.B)
}
// Error test
args = &Args{7, 0}
reply = new(Reply)
err = client.Call("Arith.Div", args, reply)
// expect an error: zero divide
if err == nil {
t.Error("Div: expected error")
} else if err.Error() != "divide by zero" {
t.Error("Div: expected divide by zero error; got", err)
}
}
func TestMalformedInput(t *testing.T) {
cli, srv := net.Pipe()
go cli.Write([]byte(`{id:1}`)) // invalid json
ServeConn(srv) // must return, not loop
}
func TestUnexpectedError(t *testing.T) {
cli, srv := myPipe()
go cli.PipeWriter.CloseWithError(errors.New("unexpected error!")) // reader will get this error
ServeConn(srv) // must return, not loop
}
// Copied from package net.
func myPipe() (*pipe, *pipe) {
r1, w1 := io.Pipe()
r2, w2 := io.Pipe()
return &pipe{r1, w2}, &pipe{r2, w1}
}
type pipe struct {
*io.PipeReader
*io.PipeWriter
}
type pipeAddr int
func (pipeAddr) Network() string {
return "pipe"
}
func (pipeAddr) String() string {
return "pipe"
}
func (p *pipe) Close() error {
err := p.PipeReader.Close()
err1 := p.PipeWriter.Close()
if err == nil {
err = err1
}
return err
}
func (p *pipe) LocalAddr() net.Addr {
return pipeAddr(0)
}
func (p *pipe) RemoteAddr() net.Addr {
return pipeAddr(0)
}
func (p *pipe) SetTimeout(nsec int64) error {
return errors.New("net.Pipe does not support timeouts")
}
func (p *pipe) SetReadTimeout(nsec int64) error {
return errors.New("net.Pipe does not support timeouts")
}
func (p *pipe) SetWriteTimeout(nsec int64) error {
return errors.New("net.Pipe does not support timeouts")
}
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